%I #4 Mar 30 2012 18:56:21
%S 3,9,10,30,37,61,72,82,85,89,90,93,96,97,104,120,138,140,144,150,178,
%T 179,182,186,200,210,219,226,238,241,255,256,269,276,279,285,292,306,
%U 309,327,343,357,364,377,382,384,385,387,413
%N Position of n-th 3 in A031111.
%K nonn
%O 1,1
%A _Clark Kimberling_
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